diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp
index 96f738e..4b0b9a5 100644
--- a/lib/Analysis/ConstantFolding.cpp
+++ b/lib/Analysis/ConstantFolding.cpp
@@ -569,9 +569,16 @@
   SmallVector<Constant*, 32> NewIdxs;
   do {
     if (const SequentialType *ATy = dyn_cast<SequentialType>(Ty)) {
-      // The only pointer indexing we'll do is on the first index of the GEP.
-      if (isa<PointerType>(ATy) && !NewIdxs.empty())
-        break;
+      if (isa<PointerType>(ATy)) {
+        // The only pointer indexing we'll do is on the first index of the GEP.
+        if (!NewIdxs.empty())
+          break;
+       
+        // Only handle pointers to sized types, not pointers to functions.
+        if (!ATy->getElementType()->isSized())
+          return 0;
+      }
+        
       // Determine which element of the array the offset points into.
       APInt ElemSize(BitWidth, TD->getTypeAllocSize(ATy->getElementType()));
       if (ElemSize == 0)